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It is now understood that Kumbuka is awake and doing well following the incident.

What we know about Kumbuka

Kumbuka, an 18-year-old western lowland gorilla, arrived at ZSL London Zoo three years ago from a zoo in Devon.

A large, male silverback and the zoo's star gorilla attraction, he is the father of Gernot, a young male who was born in November last year to Effie.

The zoo's website says of Kumbuka: "Silverback Kumbuka is our male western lowland gorilla. He arrived at ZSL London Zoo from Paignton Zoo in Devon in early 2013, and despite never having had a female mate before, was quickly spotted flirting with females Mjukuu and Effie."